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This article presents a method for digital acquisition of low-frequency signals immersed in high-frequency noise when noise frequency is higher than the sampling one. This method uses no antialiasing filters, but random sampling and filtering instead. Its formulation is developed for JRS (jitter random sampling) and finite impulse response (FIR) filters.(More)
Multiple-stage converters are composed of a set of structures with different voltage, current and switching frequency capabilities. In particular, in applications like particle accelerator beam deflection and focusing, the requirement is high-current high-precision current pulses generation. In order to satisfy the specifications of this application, a(More)
This work presents the implementation of improved architectures for simultaneous generation and correlation of mutually orthogonal complementary sets of sequences. By taking advantage of some redundancies in the generation and correlation algorithms, resources consumption is reduced and the performance of such architectures improved. The FPGA(More)
Complementary sequences are currently being applied to multiple fields of engineering. Given their particular mathematical properties, they have been widely used in applications ranging from robotics to communications, and have even been implemented in programmable logic devices (e.g. FPGA). Most of the applications proposed in the literature need to employ(More)
Multiphase converters have become an attractive alternative for high-current power converters due to their inherent reduction of semiconductor stress. Additionally, total current ripple frequency can be increased and its amplitude decreased by the phases ripple interleaving. These converters require a different number of phases and control specifications(More)
This paper discusses the implementation of a π/4-DQPSK bandpass modulator integrated solely on a digital platform, without the use of external modulators, mixers, or RF filters. Modulation and filtering are performed digitally, hence providing high performance and noise immunity. The system is described in blocks, which are later coded in VHDL and(More)
Multicarrier schemes, like OFDM, provide several advantages for channel estimation and equalization in many communication systems. Channel estimators, like LMMSE (linear minimum mean-square error) have proven to be very effective, however, they are not feasible to be implemented in real time due to its computational requirements. This work proposes a Power(More)
Power converters that operate in Discontinuous Conduction Mode (DCM) are able to reduce switching losses, when compared to Continuous Conduction Mode (CCM) operation. This reduction is mainly due to zero current commutation and the reduction of the reverse recovery losses. However, DCM operation in high power converters is limited due to the increment in(More)